What does he have?

I have a 6yr old Cat that's has not been eating or drinking hardly for 2 days, he's been doing nothing but sleep constantly for the past 2 days too, his nose is dry to the touch also, he's usually active and eats like he's starving, he goes outside alot and  it's pretty obvious he's acting like he don't feel good.  Anyone know what he could  be coming down with? 

You cat is sick and needs to see a vet ASAP. A cat cannot go very long without eating as they can develop a condition called Hepatic Lipidosis (or fatty liver disease) which is a serious illness on its own.

He does need to see a vet immediately. I would also not let him outside until he's better.